WATCH: Filmmaker Honors Late Mom in Powerful Short Film

Filmmaker Casey Warren was driven by one overriding question when he made his recent short film, From 1994: "What would you say to a loved one if you had one chance to say it all?"

It's a compelling thought, one that's all the more personal to Warren, who co-directed the short film in memory of his late mother. Though the film features fictional characters, its narrative hangs together by a letter written from a dying mother to her child—the very same letter that Warren's mother wrote to him, back in 1994. Sadly, she died of cancer when he was just 12 years old.

"She was a writer, and throughout my childhood she wrote many letters to me on her typewriter in her writing room," Warren explains on the film's official Web site. "During a family Christmas years later, my aunt passed along to me the last letter that my mom had written to me, on April 19th, 1994. This film is based on that letter."

Speaking with the Huffington Post, Warren said that one of his mother's greatest wishes was to be published. In some ways, this film is his attempt at fulfilling that wish.

"I've missed her for so long," he added. "Now I feel like she isn't gone."

(Crying yet? Just wait.) Watch the powerful film now, and prepare to be moved: